Process and apparatus for making stencils



June 4, 1929. c, Boo 1,715,350

PROCESS AND APPARATUS FOR MAKING STENCILS Filed Nbv. 192'! INVENTOR. EARL Q B907 6 WWW Patented June 4, 1929.1

wise-5e Fries.

EARL C. BOOTH, F INDIANAPOLIS, INDIANA, ASSIGNOR TO INDIANAPOLIS PUMP & TUBE COMPANY, OF INDIANAPOLIS, INDIANA, A CORPORATION.

IPROCESS AND APPARATUS FOR MAKING STENCILS.

Application filed November 3, 1927. Serial No. 230,716.

the like.

The principal object of the invention is to quickly and cheaply produce a stencil which will have the advantages of the more expensive type of stencils now in use. This has reference to that type of stencil wherein there is employeda frame overwhich is secured a mesh, such as silk or organdie protected by suitable coating, such as celluloid or the like, leaving open meshwork through which the paint or coloring may be forced by a squeegee for leaving the desired imprint. This type of stencil has been more common- 1y made by securing celluloid over the frame which has been out to leave open spaces for the lettering or other design. and covering such open spaces with a silk or organdie which is firmly stretched and held in place by suitable adhesive or binder.

The feature of this invention resides in the simple process and apparatus used in connection therewith for quickly and cheaply producing a stencil of the 'above character by merely tacking the organdie to the frame and providing a plurality of metal letters 0 or designs which may be repeatedly used. and

magnetically securing the'same in position over the mesh. After the metal letters are properly positioned and magnetically held in place, a suitable filler is brushed over the fabric so as to fill and close the interstices thereof excepting where the metal letters are positioned. The metal letters may then be magnetically released and removed, leaving open spaces forming the stencil. Thus the metal letters may be used over again in varying combinations.

The full nature of the invention will be understood from the accompanying draw- .ings and the following description and claims:

In the drawings Figure 1 is a plan view of the stencil. Fig. 2 is a section taken on the line 22 of Fig. 1. Fig. 3 is a perspective view of the magnet with the stencil mounted thereon. Fig. 4 is a central vertical section through the magnet with the stencil frame and lettering mounted thereon. i

In the drawings there is illustrated an apparatus used in the process of making stencils, as well as the=stencil made tlcreby.

Fig. 1 is illustrative of the stencil having a rectangular wooden frame 10 surrounding a suitable space which is adapted to be filled with the paint or coloring used and to recelve a squeegee for forcing it through the openings in the fabric 11 in the usual manner. As illustrated herein, there are openings 12 in the fabric forming the letters of the desired name. By openings is meant the open mesh of the fabric, the remaining portion thereof being closed by a. suitable filler.

For producing the above desired stencil, there is provided a magnetic block 13 havmg an upper face of suitable dimensions to receive the frame 10 thereover, whereby said frame will enclose the same. The block 13 and the upper face thereof is divided into three sections, a central section 14 running longitudinally thereof, and two side sections 15 and 16 positioned on each side of the central section. Each of said sections is formed of suitable metal and separated by the lead sheets 17 positioned between the same. The block 13 is mounted upon a base 18 in which there is a magnetic coil 19. The side sections, which comprise metal blocks, are supported upon the upper surface of the base 18 in electrical contact therewith, but insulated from the coil 19 by lead strips 20. The coil 19 is further insulated from the base 18 by the lead strips 21. The intermediate section 15 comprises a metal block which extends-down into the base 18 within the coil 19. By means of this arrangement a suitable electro magnet is formed by the coil 19 surrounding the block 14, which when energized causes 'magnetic lines of force to pass upwardly through the top. surface of the block 14 and down through the side blocks 15 and 16 through the base 18 and back through the bottom surface of the block.13. When the frame10, having a suitable silk ororgandie fabric stretched over the bottom thereof, is

inverted and mounted'over the top of the magnet 13, said fabric rests directly upon the upper surfaces of the three blocks 14, 15 and 16; Suitable metal plates in the form of letters or designs 21 are thereupon mounted in the desired position onthe mesh so that they span the central block 14and extend ont o'the blocks 15 and 16. The current is then turned on to energize the coil 19 and set up the magnetic linesof force which will thereupon pass through said magnetic blocks and metal plates 21 lying on the face thereof.

- This force will anchor the plates firmly in pometal or the design to be stencilled has been 'sition on the face of the b or while the same is still plastic, the coil is de-energized and the plates removed by any suitable means, such as a horseshoe magnet or the like. Upon the filler becoming completely dry, the stencil-is thenready for use.

In commercial practice, after the various letters of the alphabet have been cut from the cut, the stencil may be rapidly madesince it is only necessary to tack organdie or similar fabric over the frame, place the same on the magnet, arrange the letters thereon and apply the filler. The stencil is then completed excepting for the removal of the metallic let-' ters or designs. It will be noted that the application of the filler will seal the rough edges of the fabric where it is tacked to the ocks by reason of l frame, so that no great care need be taken in this respect.- I

The invention claimed is: 4

1. The process of making stencils consisting'in providing a frame, securing a mesh thereon, magnetically securing a metallic.

plate thereto for producing the desired let; tering or design, applying a filler to the mesh,

and thereafter removing the metal plate therefrom.

2. The process of making a stencil, consist- I ing in securing a metallic plate for forming the lettering or design'u on a mesh by magnetic force, applying a lerto the mesh over said late, and thereafter removing the same.

3. he process of makin a stencil consisting in providing a frame aving a mesh secured thereto, positioning a metallic plate thereon to form the desired design, placing the same in a magnetic field for securing said metal late to position, applying a filler to said mes about said plate, and thereafter removing said mesh from said magnetic plate and said plate from the mesh.

In witness whereof, I have hereunto afixed m fsi ature. EARL G. BOOT. 

